It still has potential. I still haven't built something I really love, and I've finally learned how to make my own vehicles, which means that I can take the ideas I've had for literally years and actually put them into the game myself.
The style is simplistic, so it doesn't take extreme skill to make an add-on that fits in (
although it does take some restraint). Building and eventing can be simple or surprisingly complex.
There's nothing else quite like it.